1 Kings 11:14-17

14Then the Lord raised up against Solomon an adversary, Hadad the Edomite, from the royal line of Edom.

15Earlier when David was fighting with Edom, Joab the commander of the army, who had gone up to bury the dead, had struck down all the men in Edom.

16Joab and all the Israelites stayed there for six months, until they had destroyed all the men in Edom.

17But Hadad, still only a boy, fled to Egypt with some Edomite officials who had served his father.